首页
登录
职称英语
Rainforests may store much less carbon than we thought. It could be time to
Rainforests may store much less carbon than we thought. It could be time to
游客
2023-08-14
33
管理
问题
Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the discovery that apparently similar forests hold vastly different amounts of the stuff. The finding is important because there are plans for governments worldwide to compensate tropical countries for protecting their forests as "carbon sinks" to curb global warming. If carbon cannot be counted, then dollars cannot be disbursed(支付).
Greg Asner of the Carnegie Institution for Science in Stanford, California, and colleagues say they used satellite mapping, laser probing of forest undergrowth from aircraft and local ground surveys across a large area of Peruvian rainforest to crack the problem of estimating how much carbon is locked up in forests. But the new technique has revealed a large, previously unknown variability in the density of carbon stored in apparently similar forests.
The Intergovernmental Panel on Climate Change says that there should be about 587 million tonnes of carbon stored in the study area, 43,000 square kilometres of lowland forest in the Madre de Dios region of Peru. But after dividing the area into 40 million individual grid(格子)squares and estimating for each the carbon stored as well as the rate at which it is being fixed and released, Asner says the real figure is just 395 million tones, a third less. "What really surprised us was how carbon storage differed among forest types and the underlying geology," says Asner. For instance, where the underlying rocks are younger, the soils and forests contain more carbon. "There has been no way to uncover these incredible patterns till now."
The study also reveals major carbon loss due to logging, farming, mining and road construction—even in areas still covered by forest. This "forest degradation" made up almost 50 per cent of all carbon lost from the forest. But the study also found substantial carbon accumulated through natural forest regrowth on abandoned land.
Asner is now conducting similar studies elsewhere round the world, which he says can be used to police the United Nations’ proposed initiative on Reducing Emissions from Deforestation and Forest Degradation in Developing Countries. This scheme would compensate countries that protect their forests to store carbon. It’s important that countries with large rainforests do this, because around 15 per cent of global carbon dioxide emissions come from tropical deforestation.
Markku Kanninen, a forest scientist at the Center for International Forestry Research, a World Bank-backed body based in Bogor, Indonesia, agrees: "This research shows the importance of improving our data on forest carbon. The IPCC global default values are not precise enough for national inventories." [br] Markku Kanninen is most likely to agree that carbon stored in forests _____.
选项
A、has been decreased lately
B、has been increased lately
C、has been underestimated
D、has been overestimated
答案
D
解析
最后一段第1句表明Markku Kanninen认为碳汇数据有改善的必要,not precise说明碳汇数据一直以来不够准确,但到底数据是“过高”,还是“过低”呢?结合第1段首句就知道了,该句中的less…than we thought表明我们一直都高估了森林存储碳的能力。因此本题应选D。并排除C。
转载请注明原文地址:https://tihaiku.com/zcyy/2926104.html
相关试题推荐
低碳生活(lowcarbonlife)对于我们普通人来说是一种态度。我们应该积极提倡并去实践低碳生活,从自己做起,从节约水电这些点滴做起。除了植树,
低碳生活(low-carbonlife)倡导人们在生活中减少二氧化碳的排放,是一种低能量、低消耗和低开支的生活方式。它要求人们以更健康、更安全和更自然
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimeto
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimeto
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
随机试题
WaterforLife[img]2018m11s/ct_eyyjsdm_eyyjsdcloze_
[originaltext]Listentopartofthetalkinaliteratureclass.Okay.U
Morepeoplethaneveraredrinkingcoffeethesedays--butinsmallquantitie
网络传播的新动态之一是()A.“拉”技术的出现 B.“拉”技术的深化 C.
A.1个 B.2个 C.3个 D.4个 E.5个
哮喘发作时应禁用A.注射肾上腺皮质激素 B.吗啡 C.非那根 D.异丙肾上
2010年海洋第三产业增加值占全国海洋生产总值的比重为:() A.48.3
同一工程中的导线,应根据不同用途选择不同颜色加以区分,电源线正极应为()。A.
劳动保障部门应当自受理工伤认定申请之日起( )内作出工伤认定。A.30日 B
髙位嫁接:是指把观赏树木的枝或芽嫁接在大规格的砧木上,实现快速形成树冠的一种培育
最新回复
(
0
)